<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=div, initial-scale=1.0">
    <title>Document</title>
    <style>
        .div2{
            width: 800px;
            height: 300px;
            border: 1px solid white;
            margin:  0px auto;
            border-radius: 410px;
            background-color: red;
        }
        .div3{
            padding: 5px;
            width: 100%;
            height: 100%;
            border: 1px solid white;
            margin:  0px auto;
            border-radius: 400px;
            box-sizing: border-box;
        }
        .div4{
            width: 714px;
            height: 214px;
            border: 1px solid;
            background-color: green;
            border-radius: 400px;
        }
        .div5{
            width: 500px;
            height: 212px;
            border: 1px solid white;
            margin: 0px auto;

        }
        .div6{
            width: 60px;
            height: 100px;
            border-top: 1px solid white;
            border-right: 1px solid white;
            border-bottom: 1px solid white;
            margin-top: 50px;
            float: left;
        }
        .div7{
            width: 30px;
            height: 40px;
            border-top: 1px solid white;
            border-right: 1px solid white;
            border-bottom: 1px solid white;
            margin-top: 30px;
            
        }
        .div8{
            width: 25px;
            height: 40px;
            border-top: 1px solid white;
            border-right: 1px solid white;
            border-bottom: 1px solid white;
            float: left;
            margin-top: 80px;
            border-radius: 0px 300px 300px 0px;
            
        }

        .div9{
            width: 60px;
            height: 100px;
            border-top: 1px solid white;
            border-left: 1px solid white;
            border-bottom: 1px solid white;
            margin-top: 50px;
            float: right;
        }
        .div10{
            width: 30px;
            height: 40px;
            border-top: 1px solid white;
            border-left: 1px solid white;
            border-bottom: 1px solid white;
            margin-top: 30px;
            float: right;
        }
        .div11{
            width: 25px;
            height: 40px;
            border-top: 1px solid white;
            border-left: 1px solid white;
            border-bottom: 1px solid white;
            float: right;
            margin-top: 80px;
            border-radius: 300px 0px 0px 300px;
        }
        .div12{
            width: 0px;
            height: 212px;
            border-left: 1px dotted white;
            margin: 0px auto;
            /* position: relative; */
            position: relative;/*相对定位*/
        } 
        .div13{
            width: 40px;
            height: 40px;
            border: 1px solid white;  
            border-radius: 300px;
            margin-top: -175px;
            margin-left: 450px;
            background-color: aqua;
            position: absolute; /*绝对定位*/
            /* position: fixed; */

        }
    </style>
</head>
<body>
    <div class="div2">
        <div class="div3">
            <div class="div3">
                <div class="div3">
                    <div class="div3">
                        <div class="div3">
                            <div class="div3">
                                <div class="div3">
                                    <div class="div4">
                                        <div class="div5">

                                            <div class="div6">
                                                <div class="div7"></div>
                                            </div>
                                            <div class="div8"></div>

                                            <div class="div9">
                                                <div class="div10"></div>
                                            </div>
                                            <div class="div11"></div>
                                            <div class="div12" ></div>
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
    <div class="div13">

    </div>
</body>
</html>